Arithmetic and control unit



FIG. 1 is a perspective view of front, top and right side of an arithmetic and control unit showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof, wherein the broken lines illustrate portions of the unit and form no part of the claimed design;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

CLAIM The ornamental design for an arithmetic and control unit, as shown and described. 